| | Warren, MI | Royal Oak, MI | United States |
| Population | 138,996 | 58,368 | 329,725,481 |
| Female Population | 51.1% | 49.0% | 50.5% |
| Male Population | 48.9% | 51.1% | 49.5% |
| Median Age | 39.1 | 35.8 | 38.4 |
| space3 | | | |
| Population - 2010 | 134,083 | 57,261 | 309,327,143 |
| Population - 2000 | 138,247 | 60,062 | 285,036,114 |
| Population - 1990 | 144,864 | 65,410 | 251,960,433 |
| Pop. 2000 to Now | -3.9% | -1.8% | 15.6% |
| Pop. 1990 to Now | -8.3% | -9.9% | 30.8% |
| space4 | | | |
| Population Density | 4,045.3 | 4,949.8 | 93.4 |
| Land Area | 34.4 | 11.8 | 3,531,905.4 |
| Water Area | 0.1 | 0.0 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Warren, MI | Royal Oak, MI | United States |
| Age 0 to 4 | 5.9% | 5.6% | 5.9% |
| Age 5 to 9 | 5.9% | 4.1% | 6.1% |
| Age 10 to 14 | 5.9% | 3.3% | 6.6% |
| Age 15 to 17 | 3.7% | 2.3% | 3.9% |
| Age 18 to 20 | 3.2% | 1.8% | 4.0% |
| Age 21 to 24 | 4.8% | 7.1% | 5.2% |
| Age 25 to 34 | 15.4% | 24.4% | 13.8% |
| Age 35 to 44 | 12.5% | 13.3% | 12.9% |
| Age 45 to 54 | 12.8% | 11.1% | 12.6% |
| Age 55 to 59 | 7.2% | 6.2% | 6.7% |
| Age 60 to 64 | 6.7% | 6.9% | 6.3% |
| Age 65 to 74 | 8.9% | 8.9% | 9.6% |
| Age 75 to 84 | 4.6% | 3.6% | 4.5% |
| Age 85 and over | 2.3% | 1.6% | 1.9% |
| space1 | | | |
| Race | | | |
| | Warren, MI | Royal Oak, MI | United States |
| White | 62.6% | 83.3% | 59.4% |
| Black | 20.7% | 5.5% | 12.2% |
| Asian | 10.5% | 3.7% | 5.6% |
| Native American | 0.2% | 0.1% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.2% | 0.3% | 0.4% |
| Two or More Races | 3.3% | 2.8% | 3.2% |
| Hispanic | 2.6% | 4.5% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Warren, MI | Royal Oak, MI | United States |
| Married Population | 43.7% | 43.4% | 49.8% |
| Currently Married | 41.8% | 42.7% | 48.0% |
| Married but Separated | 1.8% | 0.7% | 1.8% |
| Single Population | 56.3% | 56.6% | 50.2% |
| Never Married | 37.8% | 42.5% | 33.8% |
| Divorced | 11.8% | 10.0% | 10.8% |
| Widowed | 6.7% | 4.1% | 5.6% |
| space5 | | | |
| Household Size | 2.53 | 2.01 | 2.60 |
| Households | 54,502 | 28,971 | 124,010,992 |
| Family Households | 33,896 | 13,002 | 80,755,759 |
| Married couple, w/children | 26.0% | 29.6% | 30.5% |
| Married couple, no children | 38.5% | 50.2% | 42.9% |
| Non Family Households | 20,606 | 15,969 | 43,255,233 |
| Single householder, w/children | 17.9% | 8.7% | 15.8% |
| Single householder, no children | 17.6% | 11.5% | 10.8% |